<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input type="button" value="这是一个按钮" onclick="alert(哈哈哈哈)">
    <input type="button" value="这是一个按钮" onclick="alert(哈哈哈哈)">
</body>
<script>
    // alert("哈哈哈哈");
    console.log("111111")
    var name = "xiaoming";
    console.log(name)
    let age = "30"
</script>
</html> 